public void AppendDirectorySeparatorIfNotPresent_Path_ShouldReturnCorrectPath(string inputPath, string expectedPath)
        {
            // ARRANGE
            var fileSystem = new FileSystem();

            // ACT
            string actualPath = fileSystem.AppendDirectorySeparatorIfNotPresent(inputPath);

            // ASSERT
            actualPath.Should().Be(expectedPath);
        }